Abstract A selective synthesis of ethylene acetal of 4-bromo-2-furancarboxaldehyde (4) and its pinacolborane derivative (5) is described. The synthesis was carried out using 2- furancarboxaldehyde (1) that was bromi-nated to 4, 5-dibromo-2-furancarboxaldehyde (2) in an emulsion of aluminum chloride and methylene chloride. The product was isolated, protected as ethylene acetal, and selectively debrominated to the ethylene acetal of 4- ...
